Boiler for the production of hot water

ABSTRACT

The object of the present invention is to produce a single combustion chamber boiler with an annular section for the evacuation of the gases with no obstruction in it, thus avoiding the incidence of turbulence and enabling the boiler body to have a small diameter.

0 United States Patent 11 1 11 1 3,741,168 Guillou-Keredan June 26, 1973 BOILER FOR THE PRODUCTION OF HOT WATER [56] References Cited [75] Inventor: Raymond Paul Pierre UNITED STATES PATENTS Guillou-Keredan, Paris, France 3,007,457 11/1961 Ospelt 122/37 [73] Assignee: Societe DEtude Et De Construction FOREIGN PATENTS 0R APPLICATXONS De Chaudiers En Acier-Seccacier, 1,103,023 5/1955 France 122/37 Hauts de Seine, France Primary Examinerl(enneth W. Sprague [22] Flled' May 1971 Assistant Examiner-James C. Yeung [21] Appl. No.: 139,342 Attorney-Wolf, Greenfield & Sacks [30] Foreign Application Priority Data [57] S T Mar 5 1971 fiance 7107815 The ObJCCt of the present mvention 1s to produce a Single combustion chamber boiler with an annular section [52] U S Cl 122/136 R 122/149 for the evacuation of the gases with no obstruction in [51] 52 7/00 it, thus avoiding the incidence of turbulence and en- [58] Fieid R 135 R abling the boiler body to have a small diameter.

4 Claims, 4 Drawing Figures BOILER FOR THE PRODUCTION OF HOT WATER The invention relates to a high pressure boiler for use with liquid or gaseous fuels for the production of hot water.

Single combustion chamber boilers, provided along one part of their outer surface with groups of exchange units often in the form of tubes, are already known.

This type of construction has the disadvantage of causing perturbations in the evacuation of the gases at the level of the inlets of the tubes, particularly when the burner is started up, these perturbations being due to shock waves which form in the solid parts of the tubular plate.

This type of construction produces boilers with a relatively large diameter because of the large number of tubes that are required to obtain a passage of sufficiently large diameter to enable the gases to be evacuated.

The object of the present invention is to produce a single combustion chamber boiler in which the annular chamber for the evacuation of the gases has no obstructions avoiding thereby any incidence of turbulence and the body of the boiler is formed by two separate chambers completely surrounded by water, one, in a forward position, forming the single combustion chamber which operates by radiation, the other, in the prolongation of the former forming, with the help of a central smoke outlet with water circulation, a double circuit chamber for evacuating the gases by convection.

A characteristic feature of the invention is that the gases escaping from the forward part of the chamber forming the single combustion chamber pass to a second chamber by means of an annular channel formed by the concentric walls of the central unit and the envelope of the body of the boiler.

A boiler according to the invention is illustrated in the accompanying drawings in which:

FIG. 1 is a longitudinal cross-sectional view of a method of construction of the boiler.

FIG. 2 is the view showing two half cross-sections of the boiler.

FIG. 3 is a view showing a longitudinal cross-section of an other method of construction of the boiler.

FIG. 4 is a view showing two half cross-sections of the boiler in FIG. 3.

According to the invention and according to the first method of construction shown in FIGS. 1 and 2, the central unit of the body of the boiler is formed by two separate chambers l and 2, entirely surrounded by water.

The chambers l and 2 are delimited by a single piece collar 3 which extends along the entire length of the body of the boiler. The chamber 1 called the forward chamber" constitutes a single high pressure combustion chamber operating by radiation.

The chamber 2 called the rear chamber" located in the prolongation of the chamber 1 forms a double circuit chamber for the evacuation of the gases by convection, by means of a central smoke outlet 4 delimited by an annular chamber 5.

In this type of construction, the chambers l and 2 are delimited in the collar 3, each by a flat end piece reference 6 for the chamber 1 and reference 7 for the chamber 2.

The space 8 between the two end pieces 6 and 7 is connected with where the water circulates by means of the openings 9 in the portion of the collar 3 located between the chambers l and 2.

Some reinforcing struts 10 are provided between the end pieces 6 and 7 of the chambers 1 and 2.

The central collar 3 is surrounded by a collar 11 which latter is concentric with it and extends along the entire length of the boiler so as to constitute an external wall common to the chambers 1 and 2 and, with the collar 3, delimiting an annular chamber 12 in which water circulates.

The first water chamber delimited by the collars 3 and 11 is surrounded by a collar 13 and by a collar 14 which, between them, form an annular chamber 15 in which water circulates.

The collar 11 of the chamber 12 and the collar 13 of the chamber 15, between them, delimit an annular passage 16 for the smoke which makes the single combustion chamber 1 communicate with the gas exhaust chamber 2 via port 16a. When the gases reach the rear part 6 they move adjacent collar 3 back toward the front of chamber 1 in order to enter via port 16a into the annular space 16 which in turn conducts the gases to the rear part of chamber 2. I

The gases escaping from the forward part of the combustion chamber 1 pass into the annular space 16 and then into the rear part of the chamber 2 in the annular space 17 which is delimited by the outer wall 5 of the water circulation chamber 5 and the wall 3 common to chamber 1 and chamber 2.

The gases then pass toward the flat end piece 7 of the .chamber 2 from where they penetrate into the central smoke evacuation duct 4 formed by the inner collar 5 and the water circulation chamber 5.

Water is supplied to the boiler by means of an inlet 18 and a tube 19 directly feeding the chamber 12 formed by the collar 3 and the collar 11.

The circulating water passes through chamber 12 and, by means of a series of elbow joints 23 then goes into an outer annular chamber 15, the starting point 29 of the hot water being located on the upper genetrix of the collar 14 in an area situated above the chamber 2.

The water chamber 5 is supplied by a tube 19, connecting the annular chamber 12 to the annular chamber 5.

A median partition 21 placed in a horizontal plane is provided in the water chamber 5, thereby avoiding short-circuiting the water circulation in said chamber.

The circulating water in the chamber 5 escapes through the duct 22 which opens out into the upper part of the annular chamber 15.

The chamber 15 is excentered with respect to its lower part so as to provide a passage of a diameter which is larger near its lower genetrix than near its upper genetrix, in order to form a decantation chamber that can be cleaned through the inspection ports 24.

The forward part of the combustion chamber 1 is closedby a door 25 through which a burner 25a is introduced.

The rear part of the chamber 2 is closed by a door in i The entire boiler rests on a stand 27 and the wall 14 of the chamber is insulated against heat by an outside jacket 28.

In the example of construction shown in FIGS. 3 and 4, the same references designate the same constituent parts of the boiler.

This type of construction is distinguished by the fact that the collar which forms the combustion chamber 1 and thegas exhaust chamber 2 consists of two separate parts 3a and 3b. Each part is closed by a convex end piece 6 in chamber 1 and '7 in chamber 2.

The two chambers thus constituted are free to move longitudinally into the space 12 delimited by the collar 11 which enables any expansion due to the heating of the metal to be absorbed without any counter pressure. The water circulates freely in the space 8 between the two end pieces. t i

The two types of construction shown in FIG. 1 and 3 have the same advantages as regards the gas evacuation circuit.

The two types of construction enable a boiler of small diameter to be made.

It is-obvious that the invention is not limited to the examples of constructionherein. above described and illustrated and that based on the embodiments of the invention, other modes and forms of construction can be envisaged within the scope of the invention.

I claim:

;1. A high pressure boiler for use with liquid and gaseous fuels to produce hot water comprising:

a first collar;

a burner disposed at one end of said first collar for causing combustion of said gas;

a second collar surrounding said'first collar and defining therewith a first annular water passage;

a third collar surrounding said second collar and defining therewith a first annular exhaust passage forming part of a gas exhaust circuit;

a fourth collar surrounding said'third collar and defining therewith a second annular water passage,

said first and second annular water passages being of substantially the same length;

at least one partition disposed within said first collar dividing said first collar into first and second chambers, said burner being disposed at least partially in said first chamber;

means forming part of saidgas exhaust circuit for coupling exhaust gas from said first chamber to said first annular exhaust passage, said first chamber exhausting by radiation 'a portion of the calories produced by said burner;

a pair of annular wall members disposed in said second chamber within said first collar, one of said members defining a gaseous exhaust outlet, both said members defining therebetween a third annular water passage and the other of said members defining a second annular exhaust passage with a portion of said first collar, said second annular exhaust passage forming a part of said exhaust circuit and communicating with said first annular exhaust passage;

said gas exhaust being in alternate opposite directions in said first annular exhaust passage, second annular exhaust passage and gaseous exhaust outlet, respectively, whereby the gases are evacuated through said second chamber by convection.

2. The boiler of claim 1 in which said partition comprises a pair of end pieces defining a space therebetween and means for introducing circulating water into said space.

3. The boiler of claim 2 wherein said means for introducing comprises a plurality of openings permitting water circulation between said first annular water passage and said space.

4. The boiler of claim 1 wherein said first collar includes two separate collar sections, the partition between each of said first and second chambers being formed by a convex end piece being free to move to absorb expansion without counter pressure.

I! i l 

1. A high pressure boiler for use with liquid and gaseous fuels to produce hot water comprising: a first collar; a burner disposed at one end of said first collar for causing combustion of said gas; a second collar surrounding said first collar and defining therewith a first annular water passage; a third collar surrounding said second collar and defining therewith a first annular exhaust passage forming part of a gas exhaust circuit; a fourth collar surrounding said third collar and defining therewith a second annular water passage, said first and second annular water passages being of substantially the same length; at least one partition disposed within said first collar dividing said first collar into first and second chambers, said burner being disposed at least partially in said first chamber; means forming part of said gas exhaust circuit for coupling exhaust gas from said first chamber to said first annular exhaust passage, said first chamber exhausting by radiation a portion of the calories produced by said burner; a pair of annular wall members disposed in said second chamber within said first collar, one of said members defining a gaseous exhaust outlet, both said members defining therebetween a third annular water passage and the other of said members defining a second annular exhaust passage with a portion of said first collar, said second annular exhaust passage forming a part of said exhaust circuit and communicating with said first annular exhaust passage; said gas exhaust being in alternate opposite directions in said first annular exhaust passage, second annular exhaust passage and gaseous exhaust outlet, respectively, whereby the gases are evacuated through said second chamber by convection.
 2. The boiler of claim 1 in which said partition comprises a pair of end pieces defining a space therebetween and means for introducing circulating water into said space.
 3. The boiler of claim 2 wherein said means for introducing comprises a plurality of openings permitting water circulation between said first annular water passage and said space.
 4. The boiler of claim 1 wherein said first collar includes two separate collar sections, the partition between each of said first and second chambers being formed by a convex end piece being free to move to absorb expansion without counter pressure. 